Influence of Li2O-B2O3-SiO2 glass on the sintering behavior and microwave dielectric properties of BaO-0.15ZnO-4TiO2 ceramics

This paper reports the investigation of the performance of Li2O-B2O3-SiO2 (LBS) glass as a sintering aid to lower the sintering temperature of BaO-0.15ZnO-4TiO2 (BZT) ceramics, as well as the detailed study on the sintering behavior, phase evolution, microstructure and microwave dielectric properties of the resulting BZT ceramics. The addition of LBS glass significantly lowers the sintering temperature of the BZT ceramics from 1150 °C to 875-925 °C. Small amount of LBS glass promotes the densification of BZT ceramic and improves the dielectric properties. However, excessive LBS addition leads to the precipitation of glass phase and growth of abnormal grain, deteriorating the dielectric properties of the BZT ceramic. The BZT ceramic with 5 wt% LBS addition sintered at 900 °C shows excellent microwave dielectric properties: εr=27.88, Q×f=14,795 GHz.